Munoz sustained lacerations to his head and underwent surgery for a leg injury, according to a spokesman for Sen. Munoz.

An off-duty Cook County sheriff's officer who was working as an elections investigator for the Chicago Board of Commissioners followed the man and provided police with the license plate number of the car.

Police said in a statement today that police went to Bergmann's home where they found Bergmann's car and arrested him. Bergmann allegedly admitted his involvement, police said.